gistfile1.java

package org.hogel.android.AndroidTest;

import junit.framework.Assert;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.util.AttributeSet;
import android.widget.RatingBar;

public class StarBar extends RatingBar {
	private final Paint paint = new Paint();
	private final Path path = new Path();
	private static final double StarRadUnit = 2*Math.PI / 5;
	private static final double StarRadStart = - Math.PI / 2;
	private static final double[] StarRadValues = {
		StarRadStart,
		StarRadStart+StarRadUnit*2,
		StarRadStart+StarRadUnit*4,
		StarRadStart+StarRadUnit*1,
		StarRadStart+StarRadUnit*3,
	};
	private int offStarColor = Color.argb(50, 0, 0, 0);
	private int onStarColor = Color.argb(0xff, 0, 0, 0);

	private void pathStar(double cx, double cy, double r) {
		float sx = (float)(cx + r * Math.cos(StarRadValues[4]));
		float sy = (float)(cy + r * Math.sin(StarRadValues[4]));
		path.moveTo(sx, sy);
		for (double rad : StarRadValues) {
			float x = (float)(cx + r * Math.cos(rad));
			float y = (float)(cy + r * Math.sin(rad));
			path.lineTo(x, y);
		}
		path.close();
	}

	public StarBar(Context context) {
		super(context);
	}

	public StarBar(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public StarBar(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	@Override
	public void onFinishInflate() {
		super.onFinishInflate();
		paint.setAntiAlias(true);
	}

	@Override
	public void onDraw(Canvas canvas) {
		final int rating = Math.round(getRating());
		final int stars = getNumStars();
		final float w = getWidth();
		final float h = getHeight();
		final float sw = w / stars;
		Assert.assertEquals(h, sw);
		for (int i=0;i<stars;++i) {
			final float cx = (float)(i+0.5)*sw;
			final float cy = (float)sw/2;
			final float r = sw/2;

			path.reset();
			pathStar(cx, cy, r);

			final int fcolor = i < rating ? onStarColor : offStarColor;
			paint.setStrokeWidth((float) -1.0);
			paint.setStyle(Paint.Style.FILL);
			paint.setColor(fcolor);
			canvas.drawPath(path, paint);
		}
	}

	public void setOffStarColor(int offStarColor) {
		this.offStarColor = offStarColor;
	}

	public int getOffStarColor() {
		return offStarColor;
	}

	public void setOnStarColor(int onStarColor) {
		this.onStarColor = onStarColor;
	}

	public int getOnStarColor() {
		return onStarColor;
	}
}